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List:       sidewinder
Subject:    Re: [Sidewinder] Manual disk mirroring?
From:       sidewinder-admin () adeptech ! com
Date:       2002-08-16 13:59:52
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sidewinder-admin@adeptech.com wrote:

>>Well, the command you actually want is:
>>
>>dd if=/dev/sd0c of=/dev/sd1c  (note the 'c'...it is important here)
>>
>>Is this what you tried?
>>
> 
> I'm fairly certain I tried that variation[1] as well, since I know that the
> 'c' partition is for the whole disk.  It seemed to start working, as both
> drive lights went on for about one minute, but then the drive lights went
> off, and yet 30 minutes later the dd command still did not exit.  Perhaps I
> was impatient, but I didn't think it should take that long for 18G SCSI
> disks.


18G disks will take a while to do this.  You could try playing with the 
"block size" arguement.  This causes dd to read and write considerably 
larger blocks than its default.  So, something like:

dd if=/dev/sd0c of=/dev/sd1c bs=4096

could speed this up quite a bit.  You could even try bigger block sizes 
(8192, 16384, etc) if you want to experiment a bit.


-J



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